Cap title length of srcbooks

[nichochar]

Implement Title Length Validation for Srcbooks

Objective

Limit Srcbook titles (encoded as markdown h1) to a maximum length for design and pragmatic reasons.

Requirements

1. Set max title length to N characters (proposed: N = 50 44)
2. Implement validation at:
   • Import time
   • Client-side update in /srcbook view
   • Server-side update

[benjreinhart]

We already have one area that caps this at 44 characters. I believe that was calculated based on the available space in the cards on the home page and also how it looks visually on the Srcbook page.

[nichochar]

Edited initial description with 44.